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MULTIMODAL DISPLAY

MULTIMODAL DISPLAY. Visualization: Known: RT3D, Virtual Endoscopy Angio applications Image Fusion, Dental Imaging New: eg Virtual Dissection Quantification: Volumes of tumors, aneurysms Calcium Scoring, Osteo and PulmoCT Perfusion, dynamics, Cardiac Degree of Larnygo-Trachealstenosis

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MULTIMODAL DISPLAY

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  1. MULTIMODAL DISPLAY • Visualization: • Known: RT3D, Virtual Endoscopy • Angio applications • Image Fusion, Dental Imaging • New: eg Virtual Dissection • Quantification: • Volumes of tumors, aneurysms • Calcium Scoring, Osteo and PulmoCT • Perfusion, dynamics, Cardiac • Degree of Larnygo-Trachealstenosis • Assessment of infrarenal aortic aneurysms

  2. Prerequisites • Segmentation • (Region Growing) • Fuzzy Connectedness (air filled organs) • Active Contour Models (vessels) • snakes, ballons • Centerline of tubular objects • Skeletonisation

  3. Seg – Fuzzy Connetedness Udupa et al., Graphical Models and Image Processing,l 1996

  4. Fuzzy Connectedness - Performance • Airways (200-300 slices) • Incorrect slices – manuell orrection: • Normals: n=2.1 • Pathologic: n=3.9 • Time: 15 – 20s  p=0.06 n.s.

  5. Seg – ACM - Snakes • Assumptions: • Vessels round -> elliptic • Only minimal changes from slice to slice • 2.5D approach: • Set of slices initialized • For every slice: • Contour of prev.slice used for starting • Snakes adopt contour according forces in x and y-direction

  6. Seg – ACM - Snakes

  7. Skeletonisation The skeleton of an object is the locus of the centers of all the maximal inscribed hyper-- spheres

  8. Skeletonisation - Thining

  9. Skeletonisation

  10. Skeletonisation - Thining

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